This work presents an experimental and numerical study of a non-homogeneous acoustic treatment based on space-coiling unit cells. A modular phase gradient metasurface is used in the experimental analysis as a wall lining in a Grazing Impedance Tube. A metacontinuum reduced order model of the cells is used in FEM simulations to predict the experimental results. The experiments and the numerical analysis show a good agreement in terms of the predicted transmission coefficient spectrum for the selected benchmark problem. Although not optimized, the non-homogeneous acoustic treatment showed remarkable transmission loss in a wide range of frequencies, which can be explained by a subwavelength distribution of acoustic resonators with different resonance frequencies.

Palma, G., Flanagan, L., Burghignoli, L., Kennedy, J. (2023). NUMERICAL AND EXPERIMENTAL INVESTIGATION OF A PHASE GRADIENT METASURFACE LINING. In Proceedings of Forum Acusticum. European Acoustics Association, EAA.

NUMERICAL AND EXPERIMENTAL INVESTIGATION OF A PHASE GRADIENT METASURFACE LINING

Palma Giorgio
;
Burghignoli L.;
2023-01-01

Abstract

This work presents an experimental and numerical study of a non-homogeneous acoustic treatment based on space-coiling unit cells. A modular phase gradient metasurface is used in the experimental analysis as a wall lining in a Grazing Impedance Tube. A metacontinuum reduced order model of the cells is used in FEM simulations to predict the experimental results. The experiments and the numerical analysis show a good agreement in terms of the predicted transmission coefficient spectrum for the selected benchmark problem. Although not optimized, the non-homogeneous acoustic treatment showed remarkable transmission loss in a wide range of frequencies, which can be explained by a subwavelength distribution of acoustic resonators with different resonance frequencies.
2023
Palma, G., Flanagan, L., Burghignoli, L., Kennedy, J. (2023). NUMERICAL AND EXPERIMENTAL INVESTIGATION OF A PHASE GRADIENT METASURFACE LINING. In Proceedings of Forum Acusticum. European Acoustics Association, EAA.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/486209
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